feat: typing MSW callbacks

[Ericlm]

This PR adds support for typing of path params, request and responses for custom MSW callbacks.

However, I don't know which type the handlers should accept by default; I guess the params and requests are the same, but the response will be different.

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commit: 5db551f

[Ericlm]

I guess the type should be something like ResponseResolver<Params, Body, Response400 | Response200> ?

What do you think @stijnvanhulle?